Tristimulus: Color Lab

The offline colorimetry bench

Purpose-Built

Tristimulus is a rigorous color-science bench for people who work with color for a living — colorists, print and brand designers, photographers, and vision researchers. It replaces a pile of scattered web tools with one precise, on-device instrument. Everything is computed locally from bundled reference data; nothing is uploaded and no account is required.

Core Tools

Works fully offline, on a plane or in the field
No account, no sign-in, no cloud round-trips
No analytics and no data collection
Universal app for iPhone and iPad

Private by Design

No account, ads, tracking, third-party analytics, or developer-operated backend. Your work stays on your device unless you deliberately share or export it.

Use It Responsibly

Color results depend on source profiles, displays, instruments, and workflows; verify critical production output with calibrated equipment.